Centrifugal milk-separator.



PATENTED MAY 7, 1907.

G. BBRGNER. CENTRIFUGAL MILK SBPARATOR.

APPLIUATION FILED AUG. 7, 1905.

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CARL BERGNER, or sANnE, NEARBERGEDORF, NEAR HAMBURG,

i GERMANY.

CENTRiFUGAL hi'iiLKeSEPARATOR.

Specification of Letters Patent.

atented May 7, 1907.

Application tiled August '7, 1905. Serial No. 273,135.

To all whom. t muy concern:

Be it known that I, CAR i. BnneNnn, director of the Bergedorfer Eisenwerk, a citizen of the German Empire, residing at Sande, near Bergedorf, near 'Hamburg Germany, have 'invented certain new and useful improvel tion.

ments Relating to Centrifugal Milli-Sepa rators, of which the following is a specifica- A great disadvantage which has been experienced in centrifugal machines having a central milk inlet tube and inserted plates, consists in that the new milk coming from the inserted tube is not equally distributed on all. the inserted plates, its greater part flowing out at the lower part of the central tube, so that the upper inserted' plates are fed only'a little or not at all. To avoid this disadvantage many. means have heen proposed; for instance, the reduction ofthe lower part of the central tube, the provision of insertions etc., but not one ofthese auX- iliary means have fulfilled Atheir purpose completely, partly owing to the complicated nature of the arrangement proposed that rendered the construction of the centrifugal drums expensive and the cleaning of the tubes difficult.

The device to which this invention relates' effects the object in the simplest vpossible manner by means oi a peculiar contruction ofthe outlet slit, in consequence of which the milk,V whenever it is desired to do so, or

-Wheneverit is required by the proportions and conditions oi operation of the drum used its size and height, whether it is operated 'by hand or machinery, can be stowed inthe inlet pipe until its surface is level with the slit, whereupon it' is or lessl ressure. 'ly means of 'this new device it ecomes possible,.if it' is desired, to force a larger quantity of milk through any arbitrarily chosen part of the slit, and consequently to supply particular plates with larger quantities of milk than is supplied to others. The desideratum aimed at is, of course, the most uniform distribution of the milk to all the plates; to cause alarger than the ordinary quantity of milk to iiow out of 'the upper part of the drum, and consequently to supplthev plates inserted in the upper part Wit moiefmilk is only'under excep- -tional circumstances desirable.

Vpermost rows of plates,

Indesigning the slit Vthe object aimed at wastel counteract the natural 'tendency of the milk topass'in a larger volume throi;I gh theslit in the lowerpart of the pipe. This is effected by giving to the central plane,

which is assumed to cut the longitudinal axis of the slit, the forni of.' a left-handed spiral or screw, in such a manner that the direction oi the slit' in the lower part of the central inlet pipe seems to correspond to thev direction ofrotation ofv the drinn, while .it

appears to run inthe opposite direction 1n the upper part of the pipe.

In the accompanying drawing,'l\`ig;u-e 1 is a vertical longitudinal section through a drum a with a central inlet pipeb' and plates c. 'Slits i running spiral-like upward are formed at the foot of the projections d in that' side of the inlet ipe b which corresponds to the direction of) rotation. character of, the slit is made plain bythe threeV sections shown in- Figs. 2, 3 and 4. The sample' of separator drum, chosen to illustrate the invention, is provided with a sediment collector; slits constructed in accordancewith this invention can however', be formed in continuation with all drums provided with a central inlet pipe and having plates inserted therein.

in the upper part of the central inlet pipe, that is to say, the part which supplies, the uptheslit runs through the walll of the pipe in a direction'opposite to the direction of rotation ofthe drum in such .a manner that its back inner edge has-a ridge-shaped cross section, as shown'in Fig. 2. The effect of this arran 'ement is that the back inner ed e of the s 1t peels a thin iilm from the cylin er of milk rotating within the central inlet ipe, an effect due to the greater velocity of. tlie pipe compared with that of the cylinder of milk within.- Consequently the milk trying to pass through` the slit is subjected to more than ordinary pressupe, `with the result that a more compressed )ht of milk Hows into the spaces betweenvthe up-v permost rowsfof plates. The section shown 'in Fig.. 3, which corresponds to a sectionl through the middle portion ofthe perforated part of the pipe, shows the nearly radial diection of the slit in this' art of the pipe. While the slit runs in this irection its edges do not affect the cylinder of milk within the pipe in vany manner whatever. ln its The spiral A downward course the longitudinal axis of the I slit becomes still further turned to vthe left, until the direction of the slit in the lower art of the pipe is that shown in Fig. 4, thatls to:4 fr' say, it corresponds to the direction of rot' tion. In this case the'back inner edvevof does not.

slit forms an-obtuse angle, which afiect the cylinder of milk formed coneenv trically, within the central inletpipein' .throughout the upper part of the slit and reaches its maximum intensity at the uppermost end of the slit, as shown in Fig. 2.

The choice of the proper spot where the slit, ceases to receive a storing effect on the cylinder of 4milk height of the drum used. If the drums are very high, more than half the slit may be allowed to participate in it, becausefif that i's done, the' inner girdle of milk is forced up Ward until it is level with slits. In the case of lower drums, such as are the.'A manner referred to above, butnn ,the'co'n-g 'trary,

depends largely on the the upper end of the fthe sli-t a spiral 'and in what manner principallyfmanipulated by hand, it is best to have a somewhat flatter spiral for the lonitudinal axis of the slit. vIn any case, the

evice of giving to the longitudinal axis of shape makes it possible so .to vregulate the outflow of the milk that the latter alwaysreaches central inlet pipe, and iioWs out of the upper end of the' slit in an equally compact Jet,

.than out of the lower end, an effect due to the factthat the tendency of the .upper end of the slit to peel a film from the cylinder of milk up to the upper end of the effects the same result as the greater pressure y `on the lower portion of the interior column of milk. y

Having now particularly described and as certained thenature of 1nysaid invention,

thesame is to be performed, I declare that what l. claim is:

centrifugal milk separator embodying an inlet tube provided with a plurality of slots arranged in parallelism with respect to the axis o the tube, the lWalls at the eX- tremities of each of the slots extending in an opposite direction with respect to each other so thalt the slot throughout its length extends substantially in the torni of a spiral..

In testimony whereof' l. have hereunto set my hand in presence of two subscribing Witnesses.

CARL BERGNER.

Witnesses:

OTTO W. HELLMRICH, IDA CHRIST. HAFERMANN. 

